Chief Paul E. Flanagan told The Boston Herald that the 32-foot Winthrop Fire Boat "Sentinel" could be totaled. He said the low tide overnight trapped the Sentinel under the town pier, flooding its engine with corrosive salt water.

He said a passerby saw the Sentinel resting on mud Sunday morning.

The Sentinel was dislodged, pumped out and is back afloat.

Flanagan said the Sentinel participated in search-and-rescue efforts and Massachusetts Port Authority drills. It also was available for use by Homeland Security and Logan International Airport.